<template>
  <div>
       <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>权限管理</el-breadcrumb-item>
  <el-breadcrumb-item>角色列表</el-breadcrumb-item>
</el-breadcrumb>
<!-- 卡片视图 -->
<el-card>
    <!-- 添加角色按钮区 -->
    <el-row>
        <el-col>
            <el-button type="primary">添加角色</el-button>
        </el-col>
    </el-row>
    <!-- 角色列表区 -->
    <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
            <template slot-scope="scope">
                <el-row :class="['bdbottom',i1===0 ? 'bdtop' : '','vcenter']" v-for="(item1,i1) in scope.row.children"
                 :key="item1.id">
                    <!-- 渲染一级权限 -->
                    <el-col :span="5">
                    <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 渲染二级和三级权限 -->
                    <el-col :span="19">
                        <!-- 通过for循环嵌套渲染二级权限 -->
                        <el-row :class="[i2===0 ? 'bdtop' : '','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                            <el-col :span="6">
                                <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <el-col :span="18">
                                <el-tag type="warning" v-for="(item3) in item2.children"
                                 :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                            </el-col>
                        </el-row>
                    </el-col>
                </el-row>
               <!-- <pre> {{scope.row}}</pre> -->
            </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                <el-button size="mini" type="warning" icon="el-icon-setting"
                 @click="showSetRightDialog(scope.row)" >分配权限</el-button>
            </template>
        </el-table-column>
    </el-table>
</el-card>
<!-- 分配权限的对话框 -->
<el-dialog
  title="分配权限"
  :visible.sync="setRightDialogVisible"
  width="50%" @close="setRightDialogClosed">
  <!-- 树形控件 -->
  <el-tree :data="rightslist" :props="treeProps" show-checkbox 
  node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef">
  </el-tree>

  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
            // 所有角色列表数据
            rolelist:[],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible:false,
            // 所有权限的数据
            rightslist:[],
            // 树形控件的属性绑定对象
            treeProps:{
                label:'authName',
                children:'children'
            },
            // 默认选中的节点Id值的数组
            defKeys:[],
            // 当前即将分配权限的角色id
            roleId:''

        }
    },
    created(){
        this.getRolesList()
    },
    methods:{ 
        // 获取所有角色的列表
      async  getRolesList(){
           const {data:res}=await this.$http.get('roles')
           if(res.meta.status!==200){
               return this.$message.error('获取角色列表失败！')
           }
           this.rolelist=res.data
        //    console.log(this.rolelist)
        },
        // 根据id删除对应的权限
       async removeRightById(role,rightId){
            // 弹框提示用户是否要删除
          const confirmResult= await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        if(confirmResult!=='confirm'){
            return this.$message.info('取消了删除！')
        }
       const {data:res}=await this.$http.delete(`roles/${role.id}/rights/:${rightId}`)
        if(res.meta.status!==200){
            return this.$message.error('删除权限失败！')
        }
        // console.log(res)
        // 刷新权限列表
        // this.getRolesList() 
        role.children=res.data
      },
    //   展示分配权限的对话框
     async showSetRightDialog(role){
         this.roleId=role.id
        //   获取所有权限数据
        const {data:res}=await 
        this.$http.get('rights/tree')

        if(res.meta.status!==200){
            return this.$message.error('获取权限数据失败！')
            }
            // 获取到的权限数据保存到data中
            this.rightslist=res.data
            console.log(this.rightslist)
            // 获取三级节点的id
            this.getLeafKeys(role,this.defKeys)

         this.setRightDialogVisible=true
      },
    //   通过递归的形式，获取角色下所有三级权限的id
    // 并保存到数组中
    getLeafKeys(node,arr){
        if(!node.children){
            //  如果当前node节点不包含children属性，
            // 则是三级节点
            return arr.push(node.id)
        }
        node.children.forEach(item => 
        this.getLeafKeys(item,arr))
    },
    // 监听分配权限对话框的关闭时间
    setRightDialogClosed(){
        this.defKeys=[]
    },
    // 点击为角色分配权限
    async allotRights(){
        const keys=[
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys()
        ]
        const idStr=keys.join(',')
       const {data:res}=await this.$http.post(`roles/${this.roleId}
        /rights`,{rids:idStr})

        if(res.meta.status!==200){
            return this.$message.error('获取权限数据失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightDialogVisible=false
    }
    }

}
</script>

<style lang="less" scope>
.el-tag{
    margin:7px;
}
.bdtop{
    border-top:1px solid #eee;
}
.bdbottom{
    border-bottom:1px solid #eee;
}
.vcenter{
    display:flex;
    align-items: center;
}
</style>